var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var cors = require('cors');
const { Server } = require('socket.io');
const http = require('http');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();
app.use(cors());

// 创建 HTTP server
const server = http.createServer(app);

// 配置 socket.io
const io = new Server(server, {
  cors: {
    origin: "http://localhost:5173", // 你的前端地址
    methods: ["GET", "POST"],
    credentials: true
  }
});

// 设置 io 实例到 app
app.set('io', io);

// socket 连接监听
io.on('connection', (socket) => {
  console.log('用户已连接');
  
  socket.on('disconnect', () => {
    console.log('用户已断开连接');
  });
});

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

// 导出 app 和 server
module.exports = { app, server };